jackson



No. 620,347. Patented Mar. 7, |869. m. c. JAcKsoN.

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No. 620,847. Patented Mar. 7, |899. M. C. JACKSON.

ROCK DRILL.

(Appncaeion ala Feb. '7, 159s.)

(no Model.) 2 sheets-Sheet 2.

UNITED STATES PATENT OFFICE.

MANETHO C. JACKSON, OF DENVER, COLORADO, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, TO THE JACKSON DRILL AND MANUFAC- TURING COMPANY, OF SAME PLACE.

ROCK-DRILL.

SPECIFICATION forming part of Letters Patent No. 620,847', dated March 7, 1899. Application filed February '7, 189.8. Serial No. 669,304. (No model.)

To coll whom it may concern:

Beit known that I, MANETHO C. JACKSON., a citizen of the United States of America, residing at Denver, in the county of Arapahoe and State of Colorado, have invented certain new and useful Improvements in Rock-Drills; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in theart to which-it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specication.

My invention relates to improvements in rock-drills; and it consists of the features, arrangements, and combinations hereinafter described and claimed, all of which will be fully understood by reference to the accompanying drawings, in which is illustrated an embodiment thereof.

In the drawings, Figure 1 is a vertical longitudinal section taken through the drill-casing, a portion of the inclosed parts being shown in elevation. Fig. 2 is a top view of my improved drill. Fig. 3 is a section taken on the line x, Fig. 1, looking toward the right. Fig. 4 is a section taken on the line z z, Fig. 1, looking toward the left. Fig. 5 is a section taken on the line e e, Fig. 1, looking toward the right.

Similar reference characters indicating corresponding parts in these views, let the numeral 5 designate the drill-casing, in which is located the reciprocating shaft 6, surrounded by the coil-spring 7 ,whose forward extremity bears against a collar 8, fast on the shaft, while its opposite extremity engages a tension-nut 9, exteriorly threaded to engage interior threads formed on the casing extremity, which is open to receive said nut. This nut is fiattened on one side and graduated. This graduated face is provided with numerals to indicate the power of the blow which the drill will deliver when the nut is screwed into the casing to the mark indicated by the numeral. A set-screw 4 is screwed into the 'casing to engagement with the graduated face of the nut for the purpose of locking the latter in any desired position of adjustment.

The forward head 10 of the casing is attached thereto by a rod l2 and a screw 13. The rod passes through registering apertures formed in the upper part of the head and in a lug 5a, formed on the top of the casing. The rod is held in place by nuts screwed upon its threaded extremities. The screw 13 passes through an aperture in the head and is screwed into the adjacent casing extremity. This screw is held in place by a nut screwed against the head. The casing-head 10 is provided with an interiorly-projecting sleeve 10a. Between this sleeve and a collar 14 on the drill-shaft is located a'buffer-spring 15. Journaled inthe casing below the drill-shaft 6 is a transverse rotatable shaft 16, provided with two cams 17. These cams are located on opposite sides of the reciprocating shaft, and they are adapted to engage the collar 8 thereon as the shaft lis rotated.

Mounted on the rear extremity of the casi ing is a detachable housing composed of two parts 18 and 18a. These housing parts surround the shaft 6 and inclose two ratchet-collars 19 and 19a, respectively. The portion of the shaft which passes through the ratchetcollars is provided with a spiral groove 6 and a straight groove 6C. The spiral groove is shown in full lines in Fig. 1 and the straight groove in dot ted lines. The ratchet-collar 19 is provided with a lug 19, projecting into the spiral groove of the shaft, while the ratchetcollar 19a is provided with a lug 19d, projectl ing into the straight groove of the shaft. Pivotally mounted on the housing parts and engaging the teeth of each ratchet-collar are three spring-actuated dogs. The dogs engagn ing the collar 19 are designated by the reference character A, while those engaging the collar 19a are designated by the reference character B. The dog's are so arranged with reference to the toothed periphery of the said collars that while one dog is engaging a tooth the other dog isashort distance from atooth and the third dog somewhat farther from the tooth. By reason of this feature if one tooth breaks the movement of the shaft will be quickly checked by another tooth,and so on until all the dogs are broken.

The housing part 1Sa extends rearwardly IOO and is recessed to receive a small gearjwheel 20, through which the shaft 6 passes. This gear is splined on the shaft,whereby the shaft passes freely therethrough longitudinally. The gear, however, turns with' the shaft as the latter is rotated. This gear 2O meshes with another gear 21, splined on the rear eX- tremity of the feed-screw 22, which is journaled in the casing 5,and engages a nut 23,fast on the guide-track 24. When the feed-screw is automatically turned through its engaging nut as far as it will go, the gear 21 engages a rearward projection 24a of the guide-track, causing the gear to slide backward, whereby it is disengaged from its meshing gear 20.

The rear extremity of the feed-screw is provided with a hand-crank 25, which is employed to reverse or move backward the drillcasing on the track. The hand-crank may also be employed to turn the screw for the purpose of moving the casing forward in case v -it is not desired tooperate the feed automatshaft 30 is rotated by turning the hand-crank 31. This movement rotates the gear 32, which, meshing wit-h the, pinion 33, rotates the cam-shaft 16. The rotation of the lastnamed shaft imparts a corresponding movement to the cams 17, causing them to' engage the collar S and force the shaft 6 backward, compressing the power-spring 7. As soon as the shaft is released the recoil of the powerj spring throws the shaft forward, bringing the drilling-tool in forcible contact with the rock. As the shaft 6 is drawn backward its spiral groove 6 engages the lug 19C on the ratchet-collar 19, causing the drill-shaft to make a partial rotation in the direction indicated by the arrow in Fig. 4, since the dogs A prevent the ratchet-collar from turning in the opposite direction. As the shaft turns the ratchet-collar 19 is also turned, since the lug 19d on the said collar engages the straight groove 6c of the shaft. The collar 19,however, does not turn during the backward movement of the shaft. During the forward movementof the shaft the latter is locked against rotation in the reverse direct-ion by the engagement of the lug 19d on the ratchet-collar 19L with the straight groove of the shaft, since the dogs B prevent the collar from turning. The collar 19 turns in the direction indicated by the arrow in Fig. 5 during the forward movement of the shaft, the collar 19ft remaining stationary, since it can only turn when the shaft is turned. As the drill-shaft rotates the feedscrew rotates through the instrumentality of the meshing gears`20 and 21. The turning of the feed-screw carries the casing forward by virtue of the engagement of the threads of the screw with the nut 23 on the stationary guide-track 24. J ust before the feed-screw reaches its forward limit of movement the projection 24 of the guide-track engages the gear 2l and slides it backward sufficiently to throw it out of mesh with the gear 20. This feature prevents the breaking of the parts which otherwise might result in case the drillshaft were operated after the feed-screw could no longer turn. The guide-track 24 is provided with a depending apertured projection 35, having two shoulders 35 and 350,10- cated on opposite sides thereof. The lower part 35d of this projection is circular. This projection 35 is fastened to an angle-bracket 36 by means of a bolt 37, passing through registering apertures formed in the two parts. This bracket is provided with shoulders 36 and 36, which the shoulders 35L and 35C are adapted to engage. When the drill is in the upright position, the shoulders 35a and 36 are in engagement and the nut is tight on the bolt 37. When the parts are in this position, the shoulders 35C and 36c are considerably separated. When the drill-shaft has been drawn backward sufficiently to remove the drill-tool from the hole in the rock, the drillcasing and track may be tipped tov one side for the purpose of exposing the hole in the rockl by loosening the nut on the bolt 37 and turning the projection 35 on the bolt as an axle until the shoulder 35c engages the shoulder 36C.

It is evident the cams for operating the reciprocating drill-shaft may, if desired, be placed upon or formed integral with the dywheels. In this case the collar 8 would be provided with lateral projections passing through'slots formed in the casing and eX- tending into the path of the cams.

Having thus described my invention, what I claim is- 1. The combination withthe drill-casing, the reciprocating drill-shaft and the powerspring surrounding the shaft, of a crankshaft journaled in the casing, a gear fast on the crank-shaft, another shaft journaled in the casing, a cam fast on the last-nam ed shaft and adapted to vengage a collar on the reciprocating shaft, a pinion fast on the cam-shaft and meshing with the gear on the crank-shaft, a pair of fly-wheels mounted on the extremities of the cam-shaft, a feed-screw journaled in the casing, a guide-track upon which the casing is mounted, the guide-track being provided with a nut which the said screw engages, means for feeding the casing to keep pace with the movement of the drill into the rock, said means comprising a gear splined on the drill-shaft, another gear splined on the feed-screw and meshing with the gear on the drill-shaft, the guide-track being provided with a projection arranged to move the gear on the feed-screw suiciently to disengage it IOO IIC

from the gear on the drill-shaft by the time the said screw has reached its forward limit of movement.

2. The combination of the guide-track, the casing movably mounted thereon, the drillshaft mounted on the casing, means for reoiprocating the drill-shaft, means for rotating said shaft, a feed-screw journaled in the casing, the guide-track being provided with a nut which the said screw engages, means for feeding the casing to keep pace with the movement of the drill into the rock, said means comprising a gear splined on the drillshaft, another gear splined on the feed-screw and meshing with the gear on the drill-shaft, the guide-track being provided with a proj ection arranged to move the gear on the feedscrew sufficiently to disengage it from the gear on the drill-shaft, by the time said screw has reached its forward limit of movement.

3. The oombinatian with the guide-track, The drill-casing movably mounted thereon, the reciprocating shaft and the power-spring surrounding the shaft, of a crank-shaft journaled on the casing, a gear fast thereon, another shaft journaled in the casing, a cam fast thereon and adapted to engage a collar on the drill-shaft, a pinion fast on the cam-shaft and meshing with the gear on the crank-shaft, the guide-track being provided with an apertured depending shouldered projection, and an apertured bracket adapted to be bolted to said projection and provided with shoulders adapted to engage the shoulders of the projection, the shoulders of the two parts being separated on one side, as and for the purpose set forth.

4:. The combination of the guide-track and the drill-casing movably mounted thereon, the said track being provided with an apertured depending shouldered projection, and an apertured bracket adapted to be bolted to said projection, and provided with shoulders adapted to engage the shoulders thereof, the shoulders of the two parts being separated on one side, as and for the purpose set forth.

In testimony whereof I affix my signature in presence of two Witnesses. l

MANETHO C. JACKSON.

Witnesses:

G. J. ROLLANDET, A. J. OBRIEN. 

